Nicole Kidman
is revealing the secret to a success marriage in Hollywood -- love letters!

The actress is gracing the cover of the March issue of InStyle, where she's dishing on how she and her hubby Keith Urban stay connected while they're apart.

"For every single night he's away, he leaves me a love letter. Every single night of our relationship," she tells the mag.

The 46-year-old also puts in effort to keep the long-distance to a minimum by joining him on tour.

"That's basically how I've seen most of America, on that bus. Keith and I are both gypsies at heart," she explains. "We can make our home wherever we are. The girls are like that too now, so we take them everywhere."

While the family often spends time on the road, the cute couple and their two daughters -- Sunday, 5, and Faith, 3, -- also have a home in Nashville, Tennessee.

"I'm very country at heart. I have a real desire to be outdoors, a desire for simplicity—a slightly slower, relaxed approach to life," the mother-of-two adds. "A community, not a big-city feel. That's what I grew up with, and it's what I prefer."

Nicole certainly seems happier than ever!

What do you think about Kidman's candid comments? Sound off below, and click "Launch Gallery" above to see more cute celebrity couples!

To read more of her interview, check out InStyle, on stands February 14.

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